The area of Fountaingrove appeared to be particularly hard hit, with photos showing numerous homes on fire. Officials said homes were also lost in the community of Kenwood and at a mobile home
park off the 101 Freeway.

No deaths have been reported yet in Napa County, though people are being treated at hospitals for injuries, she said. There are no estimates of how many may be injured.

The two largest fires were the Atlas Peak fire near the city of Napa, which was burning more than 10,000 acres as of 6:45 a.m., and the Tubbs fire, spreading from Calistoga to Santa Rosa in Sonoma County, according to Napa County spokeswoman Kristi Jourdan. That fire was at 20,000 acres, according to the Santa Rosa Fire Department.

Cal Fire is keeping track of three other fires in Napa, Sonoma and Lake counties, said spokesman Will Powers. The Adobe fire in Sonoma County is affecting Glen Ellen and Kenwood, the Patrick fire is hitting Napa, and the Sulfur Fire in Lake County is threatening Clearlake, he said.

Taking all the fires into account, more than 1,000 people have been evacuated, he said.

Structures have burned, though there is no estimate of how far the fires have spread and how many structures have burned, Rattigan said.

The fires began around 10 p.m., she said.

The cause of the fires are still under investigation.

Upwards of 300 firefighters are battling the blazes in Napa County, she said. There are three evacuation centers for Napa County residents, though one—the Crosswalk Community Church—is full, she said. The other two are the Calistoga Fairgrounds and at Napa Valley College.

Residents can text their ZIP code to 888777 to receive Nixle alerts about the fires and evacuation centers, she said.